A Georgia physician says her plan to honor a fallen soldier by singing the U.S. national anthem aboard a Delta Air Lines plane carrying the soldier's casket was stopped by a flight attendant who told her it would violate company policy.

Dr. Pamela Gaudry of Savannah said she and fellow passengers were told "to stay quietly in our seats" as an honor guard escorted the casket from the plane Saturday after it had arrived in Atlanta from Philadelphia. She said a flight attendant told her that singing "The Star Spangled Banner" would make passengers from other countries uncomfortable.

Delta spokesman Anthony Black said Monday that the airline has no policy on singing the national anthem. He declined to comment on Gaudry's account, which she told in a video viewed more than 740,000 times on Facebook.